<pre class="shiki github-dark shaku"><code>window.myLocalStorage = { /* it doesn't store object it store string */ getItem(key) { if(!localStorage.getItem(key))return null; const {value, expireTime} = JSON.parse(localStorage.getItem(key)); if(expireTime === null || Date.now() &lt; expireTime)return value; else { this.removeItem(key); return null; } }, setItem(key, value, maxAge) { const expireTime = typeof maxAge === 'number' &amp;&amp; maxAge &gt;= 0 ? Date.now() + maxAge : null; const valObject = { value, expireTime }; localStorage.setItem(key, JSON.stringify(valObject)); }, removeItem(key) { localStorage.removeItem(key); }, clear() { localStorage.clear(); }, clearExpiredData() { //local storage is object Object.keys(localStorage).forEach((key) =&gt; { const item = localStorage.getItem(key); if(item) { const {expireTime} = JSON.parse(item); if(expireTime !== null &amp;&amp; Date.now() &gt;= expireTime)localStorage.removeItem(key); } }) }}</code></pre>

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localStorage is a simple and handy client-side storage, but you should avoid using it because it is synchronous. Also Safari's ITP actually deletes cl…